Four Types Of Operating System

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Before long nearly all computer users will be utilizing operating systems with their equipment. These operating systems consist of both supervisor programs & language processors. It gives an execution environment for running programs.

The execution environment provides a program with the processor time and memory space that it needs to run. The execution environment gives interfaces through which a program can use storage, networks, I/O devices, and other system hardware Components.

Interfaces give a simplified, abstract view of hardware to application programs. The execution environment separate running programs from one another and prevents unwanted interactions among them. There are main four types of operating system:-

• Real time operating
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The categories are:
• Real-time operating system (RTOS) - Real time operating system is a system which is used for controlling machinery, scientific instruments and industrial systems.RTOS is an operating system (OS) planned for serve real-time application process data as it comes in, usually without buffering delays. An RTOS usually has very small amount of user interface capability and no user serviceability since the system will be a “sealed box” when forwarded for use. It is an operating system that assures a certain proficiency within a specific time constraint. RTOS is a computer surrounding that responds to an input within definite period of time. A very important element of an RTOS is to manage the resources of computer so that a specific operation finishes in absolutely the same amount of time, every time it happens.

• Single-user, single task -Single user single task is an operating system which is designed to manage the computer so that one user can effectively do one thing at a time. The Palm OS for Palm handheld computers is a good example of a modern single-user, single-task operating
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It allows many users to take advantage of computer’s resources simultaneously. The operating system must keep that point in mind that requirements of the various users are balanced, and each of the programs they are using has enough and independent resources so that a problem with one user does not affect the entire group of users. UNIX, VMS and mainframe operating systems, such as MVS, are examples of multi-user operating systems.
It's important to differentiate between multi-user operating systems and single-user operating systems that support networking. Windows 2000 and Novell Netware can each support hundreds or thousands of networked users, but the operating systems themselves aren't true multi-user operating systems. The system administrator is the only "user" for Windows 2000 or Netware. The network support and all of the remote user logins the network enables are, in the overall plan of the operating system, a program being run by the administrative

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